In policy and practice, urban Nature-Based Solutions (NBS) are considered promising innovations for sustainable urban transformation. NBS are interventions that use nature to address multiple sustainability challenges simultaneously. As such, they present a novel perspective on urban land use and development. Yet their current uptake into urban development lags behind EU ambitions. Drawing from transitions studies, this paper suggests that the limited uptake of NBS innovation stems from structural conditions that keep urban development systems locked in their current state, thereby favouring traditional ‘grey’ development. With a systematic literature review, we identify preliminary structural conditions that likely affect the uptake of urban NBS, culminating in a framework of ‘urban infrastructure regimes’, which we then illustrate with two European examples of urban NBS. Our findings indicate the relevance of using a transitions studies perspective for generating insights into the structural conditions – knowledge base, policy paradigms, etc. – that underlie barriers and opportunities for NBS uptake. We particularly argue that identifying the state and obduracy of these conditions provides a deeper understanding of how NBS uptake takes place. Findings also suggest that nature-based innovations require a customised transitions framework that accounts for the role of physical geographies.

在政策和实践中，基于城市自然的解决方案 (NBS) 被认为是可持续城市转型的有前途的创新。NBS 是利用自然同时解决多个可持续性挑战的干预措施。因此，他们提出了城市土地利用和开发的新视角。然而，他们目前对城市发展的吸收落后于欧盟的雄心。本文从转型研究中得出结论，NBS 创新的有限吸收源于将城市发展系统锁定在当前状态的结构条件，从而有利于传统的“灰色”发展。通过系统的文献综述，我们确定了可能影响城市 NBS 吸收的初步结构条件，最终形成了“城市基础设施制度”框架，然后我们用两个欧洲城市 NBS 的例子来说明。我们的研究结果表明，使用转型研究的视角来洞察结构条件（知识库、政策范式等）的相关性，这些条件是 NBS 采纳的障碍和机会的基础。我们特别认为，确定这些条件的状态和顽固性可以更深入地了解 NBS 吸收是如何发生的。调查结果还表明，基于自然的创新需要一个定制的过渡框架，以解释自然地理的作用。我们特别认为，确定这些条件的状态和顽固性可以更深入地了解 NBS 吸收是如何发生的。调查结果还表明，基于自然的创新需要一个定制的过渡框架，以解释自然地理的作用。我们特别认为，确定这些条件的状态和顽固性可以更深入地了解 NBS 吸收是如何发生的。调查结果还表明，基于自然的创新需要一个定制的过渡框架，以解释自然地理的作用。